Volte on s22ultra oneui7 issues

[jamalAlbalushi]

I'm using s22 ultra since 4 years last update having issues with volte is not working while calls as shown in pic's attached 

[Didionpc]

maybe some setting change by your network provider ,I have same issue while calling data gone off after call end data goes on but I face this issue in one city if I travel to other city its working fine.